DE4208409A1 - METHOD FOR PRODUCING Sintered Urand Oxide - Google Patents
METHOD FOR PRODUCING Sintered Urand OxideInfo
- Publication number
- DE4208409A1 DE4208409A1 DE4208409A DE4208409A DE4208409A1 DE 4208409 A1 DE4208409 A1 DE 4208409A1 DE 4208409 A DE4208409 A DE 4208409A DE 4208409 A DE4208409 A DE 4208409A DE 4208409 A1 DE4208409 A1 DE 4208409A1
- Authority
- DE
- Germany
- Prior art keywords
- compacts
- microns
- temperature
- uranium dioxide
- sintered
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000004519 manufacturing process Methods 0.000 title description 4
- OOAWCECZEHPMBX-UHFFFAOYSA-N oxygen(2-);uranium(4+) Chemical compound [O-2].[O-2].[U+4] OOAWCECZEHPMBX-UHFFFAOYSA-N 0.000 claims description 19
- FCTBKIHDJGHPPO-UHFFFAOYSA-N uranium dioxide Inorganic materials O=[U]=O FCTBKIHDJGHPPO-UHFFFAOYSA-N 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 18
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 10
- 244000052616 bacterial pathogen Species 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 5
- 239000001569 carbon dioxide Substances 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 5
- 238000005245 sintering Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 239000001257 hydrogen Substances 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 3
- 239000008187 granular material Substances 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims 1
- 239000008188 pellet Substances 0.000 description 17
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 239000003758 nuclear fuel Substances 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000004992 fission Effects 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/42—Selection of substances for use as reactor fuel
- G21C3/58—Solid reactor fuel Pellets made of fissile material
- G21C3/62—Ceramic fuel
- G21C3/623—Oxide fuels
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G43/00—Compounds of uranium
- C01G43/01—Oxides; Hydroxides
- C01G43/025—Uranium dioxide
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/51—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on compounds of actinides
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B25/00—Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/16—Oxides
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32082—Radio frequency generated discharge
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32431—Constructional details of the reactor
- H01J37/32532—Electrodes
- H01J37/32577—Electrical connecting means
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Organic Chemistry (AREA)
- Plasma & Fusion (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Crystallography & Structural Chemistry (AREA)
- Ceramic Engineering (AREA)
- Analytical Chemistry (AREA)
- Metallurgy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- High Energy & Nuclear Physics (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
- Compositions Of Oxide Ceramics (AREA)
Description
Diese Erfindung betrifft die Herstellung von gesintertem Urandi oxid.This invention relates to the manufacture of sintered urandi oxide.
Es ist bekannt, daß das Sintern von Urandioxid bei hohen Temperatu ren in einer Kohlendioxidumgebung normalerweise zu einem gesinter ten Urandioxid führt, das ein übermäßiges Kornwachstum aufweist. Es können beispielsweise Körner Abmessungen von mehr als 1000 Mikron erreichen. Demzufolge gibt es üblicherweise im gesinterten Urandi oxid nur wenige Körner, und diese werden Keime gebildet haben und dann in einem Stadium während der mikrostrukturellen Entwicklung des gesinterten Urandioxids auf Kosten anderer Körner bevorzugt ge wachsen sein. Dies erzeugt eine Besetzung von Körnern, in der sehr wenige Körner, die das meiste vom Pelletvolumen aufweisen, eine übermäßige Größe (größer als 1000 Mikron) aufweisen, und die ver bleibenden Körner sind von verhältnismäßig geringer Größe (etwa 20 Mikron). Dies führt zu einem gesinterten Urandioxid mit unstabiler Mikrostruktur, das zur Verwendung als Kernbrennstoff in einem Kern reaktor unerwünscht ist.It is known that the sintering of uranium dioxide at high temperatures normally sintered in a carbon dioxide environment leads uranium dioxide, which has an excessive grain growth. It For example, grains can have dimensions of more than 1000 microns to reach. As a result, there is usually in the sintered Urandi only a few grains oxide and these will have formed and germs then at a stage during microstructural development the sintered uranium dioxide is preferred at the expense of other grains grow. This creates an occupation of grains in the very few grains that have the most pellet volume, one have excessive size (larger than 1000 microns), and the ver permanent grains are relatively small in size (about 20 Micron). This leads to a sintered uranium dioxide with unstable Microstructure intended for use as a nuclear fuel in a core reactor is undesirable.
Es ist ein Ziel der Erfindung, ein Verfahren zur Herstellung gesin terten Urandioxids zu finden, das, wenn es in einer Kohlendioxidum gebung gesintert wird, eine gleichmäßigere Mikrostruktur aufweist. It is an object of the invention to provide a method for manufacturing tertiary uranium dioxide to find that when it is in a carbon dioxide is sintered, has a more uniform microstructure.
Gemäß der vorliegenden Erfindung ist ein Verfahren zur Herstellung gesinterten Urandioxids vorgesehen, das eine im wesentlichen gleichförmige Mikrostruktur aufweist, wobei das Verfahren die Schritte umfaßt, ein Gemisch aus einer vorbestimmten Menge an Kei men zu bilden, die Urandioxid-Einzelkristalle umfassen, und aus ei nem Pulver, das Urandioxid aufweist, ein Granulat aus dem Gemisch zu erzeugen, Preßlinge aus dem Gemisch zu formen, die Preßlinge bei einer ersten Temperatur in einer Gasumgebung zu sintern, die Koh lendioxid enthält, und dann die Preßlinge einer reduzierenden Gas umgebung auszusetzen, die Wasserstoff aufweist, und zwar bei einer wesentlich niedrigeren Temperatur als der ersten Temperatur, wobei die Menge an Keimen so ist, daß sie die Mikrostruktur der gesinter ten Preßlinge durch Verhindern übermäßigen Kornwachstumes in den Preßlingen während des genannten Sinterschrittes stabilisiert.According to the present invention is a method of manufacture sintered uranium dioxide is provided, which is essentially one having a uniform microstructure, the method comprising Steps comprises a mixture of a predetermined amount of Kei to form men, which comprise uranium dioxide single crystals, and from ei nem powder containing uranium dioxide, a granulate from the mixture to produce compacts from the mixture, the compacts sinter a first temperature in a gas environment, the Koh contains dioxide, and then the compacts of a reducing gas suspend environment that contains hydrogen at one significantly lower temperature than the first temperature, wherein The amount of germs is such that they sinter the microstructure th compacts by preventing excessive grain growth in the Compacts stabilized during the said sintering step.
Vorzugsweise sind die Keime so gewählt, daß sie eine Größe aufwei sen, die 38 Mikron nicht überschreitet, beispielsweise in den fol genden Größenbereichen: 30-38 Mikron, 20-30 Mikron, 10-20 Mikron und weniger als 10 Mikron.The nuclei are preferably selected so that they have a size sen, which does not exceed 38 microns, for example in fol size ranges: 30-38 microns, 20-30 microns, 10-20 microns and less than 10 microns.
Vorteilhafterweise sind die Keime mit dem Pulver in einer Menge von 2 Gew.-% vermischt.The germs with the powder are advantageously present in an amount of 2 wt .-% mixed.
In einer bevorzugten Form der Erfindung wird der Sinterschritt bei einer Temperatur von etwa 1700°C durchgeführt, und der Reduzier schritt wird bei einer Temperatur von etwa 1150°C durchgeführt, mit Erwärmungs- und Abkühlungsgeschwindigkeiten von 10°C pro Minute zwischen Umgebungstemperatur und 1700°C und beim Abkühlen von 1700°C auf 1150°C.In a preferred form of the invention, the sintering step is carried out a temperature of about 1700 ° C, and the reducer step is carried out at a temperature of about 1150 ° C with Heating and cooling rates of 10 ° C per minute between ambient temperature and 1700 ° C and when cooling from 1700 ° C to 1150 ° C.
Die Erfindung umfaßt ferner gesintertes Urandioxid, das durch das Verfahren der Erfindung hergestellt ist und das die Form zylindri scher Pellets aufweisen kann.The invention further encompasses sintered uranium dioxide produced by the Method of the invention is produced and the shape is cylindrical shear pellets.
Die Erfindung wird nun nur beispielsweise in den folgenden Beispie len noch näher beschrieben:The invention will now only be described, for example, in the following examples len described in more detail:
Keimkristalle aus Urandioxid wurden hergestellt durch den Hochtem peraturzerfall von Urandioxid in trockenem Wasserstoff. Um dies zu erreichen, wurden Grünpellets aus Urandioxid eine Stunde lang auf 2100°C erwärmt, unter Benutzung von Erwärmungs- und Abkühlungsge schwindigkeiten, die auf 20°C pro Minute ausgesteuert wurden. Die erhaltenen Keime wurden gesiebt, um Keine eines ausgewählten Größenbereichs - 30-38 Mikron - zu erhalten. Die Keime wurden mit Urandioxidpulver in einer Menge von 2 Gew.-% vermischt und das Ge misch wurde durch mehrfaches Sieben durch ein 106-Mikron-Sieb homo genisiert. Das homogenisierte Gemisch wurde granuliert und pelle tiert, wonach die Pellets bei einem Druck von vier Tonnen pro Qua dratzentimeter zur Erzeugung von Grünpellets gepreßt wurden. Die Grünpellets wurden fünf Stunden lang in strömendem Kohlendioxid bei 1700°C gesintert und anschließend eine Stunde lang bei 1150°C in Wasserstoff reduziert, bevor sie auf Raumtemperatur abkühlen konn ten. Die Erwärmungs- und Abkühlgeschwindigkeiten zwischen der Raum temperatur und 1700°C sowie bei der Abkühlung auf 1150°C wurden auf 10°C pro Minute ausgesteuert. Proben der gesinterten Pellets wurden keramographisch präpariert und analysiert, um die Korngröße zu be stimmen. Die Ergebnisse zeigten, daß die mittlere Korngröße in den Pellets etwa 45,5 Mikron mit einer insgesamt gleichförmigen Mikro struktur betrug.Seed crystals from uranium dioxide were produced by the Hochtem temperature decay of uranium dioxide in dry hydrogen. To do this reached, uranium dioxide green pellets were left on for one hour Heated at 2100 ° C using heating and cooling ge speeds that were set to 20 ° C per minute. The Germs obtained were sieved to none of a selected one Size range - 30-38 microns. The germs were with Uranium dioxide powder mixed in an amount of 2 wt .-% and the Ge mixing was achieved by repeated sieving through a 106 micron sieve homo embarrassed. The homogenized mixture was granulated and peeled tiert, after which the pellets at a pressure of four tons per qua three centimeters were pressed to produce green pellets. The Green pellets were placed in flowing carbon dioxide for five hours Sintered at 1700 ° C and then at 1150 ° C for one hour Reduced hydrogen before it could cool to room temperature ten. The heating and cooling rates between the room temperature and 1700 ° C as well as when cooling to 1150 ° C Controlled at 10 ° C per minute. Sintered pellet samples were taken prepared and analyzed by ceramography to determine the grain size vote. The results showed that the average grain size in the Pellets about 45.5 microns with an overall uniform micro structure was fraud.
Das Verfahren wurde wie im Beispiel I wiederholt, mit der Ausnahme, daß Keime eines Größenbereichs von 20-30 Mikron ausgewählt wur den. Die Analyse der gesinterten Pellets zeigte, daß die mittlere Korngröße etwa 42,1 Mikron betrug.The procedure was repeated as in Example I, except that that 20-30 micron size nuclei were selected the. Analysis of the sintered pellets showed that the middle Grain size was approximately 42.1 microns.
Das Verfahren wurde wie im Beispiel I wiederholt, mit der Ausnahme, daß Keime eines Größenbereichs von 10-20 Mikron ausgewählt wur den. Die Analyse der gesinterten Pellets zeigte, daß die mittlere Korngröße etwa 40,2 Mikron betrug.The procedure was repeated as in Example I, except that that 10-20 micron size nuclei were selected the. Analysis of the sintered pellets showed that the middle Grain size was about 40.2 microns.
Das Verfahren wurde wie im Beispiel I wiederholt, mit der Ausnahme, daß Keime eines Größenbereichs von weniger als 10 Mikron ausgewählt wurden. Die Analyse der gesinterten Pellets zeigte, daß die mittle re Korngröße etwa 32,3 Mikron betrug.The procedure was repeated as in Example I, except that that seeds of a size range of less than 10 microns are selected were. Analysis of the sintered pellets showed that the mean re grain size was about 32.3 microns.
In jedem der obigen Beispiele wurden verhältnismäßig große Korn größen erzeugt, aber in einer im wesentlichen gleichförmigen Mikro struktur. Wenn dagegen das Verfahren bei nicht mit Keimen versehe nen Urandioxidpellets durchgeführt wurde, dann führte dies zu einem übermäßigen Kornwachstum mit manchen Korngrößen von wenigstens 1000 Mikron, und zu Bereichen von Pellets, die kleine Körner mit einer Größe von etwa 20 Mikron enthalten.In each of the above examples, the grain size was relatively large sizes produced, but in a substantially uniform micro structure. On the other hand, if the procedure does not germinate If a uranium dioxide pellet was carried out, this led to a excessive grain growth with some grain sizes of at least 1000 Micron, and to areas of pellets containing small grains with a Size of about 20 microns included.
Es ist einer der Vorteile der Erfindung, daß es das Verfahren er möglicht, daß Urandioxidpellets ohne unkontrolliertes Kornwachstum in den Pellets in Kohlendioxid gesintert werden.It is one of the advantages of the invention that it is the process possible that uranium dioxide pellets without uncontrolled grain growth are sintered in carbon dioxide in the pellets.
Es ist ein anderer Vorteil, daß das Verfahren in festem Aggregatzu stand ohne Anwesenheit einer flüssigen Phase der Keime oder des Pulvers stattfindet.It is another advantage that the process is in a solid state stood without the presence of a liquid phase of the germs or Powder takes place.
Es ist ein noch weiterer Vorteil, daß es die Anwendung des Verfah rens ermöglicht, Urandioxidpellets zu erzeugen, die Korngrößen auf weisen, welche das Zurückhalten von Spaltgas fördern, wenn sie als Kernbrennstoffpellets in Kernkraftreaktoren verwendet werden.It is still another advantage that it is the application of the procedure rens enables uranium dioxide pellets to be produced based on the grain sizes point, which promote the retention of fission gas when they Nuclear fuel pellets are used in nuclear power reactors.
Obwohl die Erfindung im Zusammenhang mit der Anwendung von 2 Gew.-% an Keimen beschreiben wurde, können für spezielle Zwecke auch ande re Mengen angewandt werden.Although the invention is related to the use of 2% by weight germs can also be used for special purposes re quantities are applied.
Claims (7)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9108189A GB2255085B (en) | 1991-04-17 | 1991-04-17 | Manufacture of sintered uranium dioxide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE4208409A1 true DE4208409A1 (en) | 1992-10-22 |
Family
ID=10693433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE4208409A Withdrawn DE4208409A1 (en) | 1991-04-17 | 1992-03-16 | METHOD FOR PRODUCING Sintered Urand Oxide |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5211905A (en) |
| JP (1) | JP3110544B2 (en) |
| CA (1) | CA2062014C (en) |
| DE (1) | DE4208409A1 (en) |
| ES (1) | ES2036493B1 (en) |
| FR (1) | FR2675412B1 (en) |
| GB (1) | GB2255085B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19934516A1 (en) * | 1999-07-22 | 2001-01-25 | Siemens Ag | Sintered body for fuel element in boiling water or pressurized water reactors is made of a sintered material with a longitudinally extended grains in a preferred direction |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100283728B1 (en) * | 1999-03-05 | 2001-02-15 | 장인순 | Method for manufacturing a large-grained UO2 fuel pellet |
| WO2014028731A1 (en) | 2012-08-15 | 2014-02-20 | University Of Florida Research Foundation, Inc. | High density uo2 and high thermal conductivity uo2 composites by spark plasma sintering (sps) |
| KR101535173B1 (en) * | 2013-12-27 | 2015-07-10 | 한국원자력연구원 | The method for fabrication of oxide fuel pellets and the oxide fuel pellets thereby |
| CN107731318B (en) * | 2017-10-27 | 2019-07-02 | 中国工程物理研究院材料研究所 | A kind of preparation method of monocrystalline uranium dioxide fuel ball |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1575154A (en) * | 1967-08-04 | 1969-07-18 | ||
| AU453294B2 (en) * | 1970-04-09 | 1974-09-10 | Australian Atomic Energy Commission | Improved sintering process for production of uranium dioxide pellets |
| SE366015B (en) * | 1970-08-10 | 1974-04-08 | Gen Electric | |
| US3752872A (en) * | 1971-08-26 | 1973-08-14 | Atomic Energy Commission | Method of preparing uniform size powders |
| GB2020641B (en) * | 1978-05-15 | 1982-10-13 | British Nuclear Fuels Ltd | Nuclear fuel pellets containing niobium pentoxide |
| GB2177249B (en) * | 1985-07-05 | 1988-12-14 | British Nuclear Fuels Plc | Nuclear fuel bodies |
| JPS6425093A (en) * | 1987-07-21 | 1989-01-27 | Mitsubishi Atomic Power Ind | Manufacturing method of oxide nuclear fuel body |
| GB8724514D0 (en) * | 1987-10-20 | 1987-11-25 | British Nuclear Fuels Plc | Production of ceramic nuclear fuel pellets |
| JPH01126591A (en) * | 1987-11-12 | 1989-05-18 | Japan Atom Energy Res Inst | Manufacture of large crystal grain size uo2 fuel using no additives |
| JPH0731266B2 (en) * | 1989-03-31 | 1995-04-10 | 原子燃料工業株式会社 | Manufacturing method of nuclear fuel sintered body |
| GB8920112D0 (en) * | 1989-09-06 | 1989-10-18 | British Nuclear Fuels Plc | Nuclear fuel bodies and the production thereof |
| JPH03170898A (en) * | 1989-11-29 | 1991-07-24 | Nuclear Fuel Ind Ltd | Preparation of nuclear fuel ceramic |
-
1991
- 1991-04-17 GB GB9108189A patent/GB2255085B/en not_active Expired - Lifetime
-
1992
- 1992-03-06 CA CA002062014A patent/CA2062014C/en not_active Expired - Fee Related
- 1992-03-16 DE DE4208409A patent/DE4208409A1/en not_active Withdrawn
- 1992-03-23 JP JP04065153A patent/JP3110544B2/en not_active Expired - Fee Related
- 1992-04-06 ES ES9200726A patent/ES2036493B1/en not_active Expired - Fee Related
- 1992-04-16 FR FR9204704A patent/FR2675412B1/en not_active Expired - Fee Related
- 1992-04-17 US US07/872,719 patent/US5211905A/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19934516A1 (en) * | 1999-07-22 | 2001-01-25 | Siemens Ag | Sintered body for fuel element in boiling water or pressurized water reactors is made of a sintered material with a longitudinally extended grains in a preferred direction |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2675412A1 (en) | 1992-10-23 |
| GB2255085B (en) | 1994-11-16 |
| US5211905A (en) | 1993-05-18 |
| GB9108189D0 (en) | 1991-06-05 |
| GB2255085A (en) | 1992-10-28 |
| CA2062014C (en) | 2000-05-09 |
| JPH05100086A (en) | 1993-04-23 |
| ES2036493A1 (en) | 1993-05-16 |
| FR2675412B1 (en) | 1997-04-25 |
| CA2062014A1 (en) | 1992-10-18 |
| JP3110544B2 (en) | 2000-11-20 |
| ES2036493B1 (en) | 1994-02-01 |
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